10 Best Concentrate Pen of September 2025

• Classic gameplay: Einstein Logic Puzzle, or Einstein Riddle
• Several difficulty levels (from 4x4 to 9x16)
• Filters help you find the best clues or hints
• Totally free, with 5000 free boards (more to come!)

Rottz Games

Timber Press

• quick classic grid-style logic puzzles, perfect for phones & tablets
• free daily puzzle and 35 graded puzzles included, more puzzles available for purchase
• Smart Hints analyze your board and explain the next move. Multi-level undo and check for errors
• statistics for average completion time and 3 levels of difficulty
• Cloud Sync saves puzzles & unlocks purchases across multiple devices (e.g. Kindle Fire & Android phone)

Egghead Games

MichPong

• 【By Coil-Less Technology】:The pressure-sealed ceramic BOWL will heat your wax instead of scorching it with coils, providing the purest flavor.
  
• 【Auto-Mode Design】:10 seconds continuous heat mode by double-tapping the button to initiate the auto mode which will give you perfect experience.
  
• 【Never Lose Tool】:Brand new design combined the cap, loading tool into the inside. You will never need a separate tool.
  
• 【3 Heating Setting】:Select your own desired heat modes based on your consumption priorities and load size. From 3.2V, 3.6V and the highest is 4.1V.
  

BAAD